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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.0.77

Slow Operation Detection and Diagnostics

Performance monitoring has been added for operations that may cause UI lag or delays:

  • JSON.stringify, JSON.parse, and structuredClone operations now log warnings when they take >200ms
  • fs.writeFileSync operations include size information in slow operation warnings
  • execSync shell commands are monitored for slow execution
  • All slow operations are reported via telemetry for aggregate analysis
Evidence

duA() at line 3224 (slow operation wrapper, contains "[SLOW OPERATION DETECTED]")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.0.77 →